Mounting and support means for furnace burners



Dec. 7, 1943. l. B. LUELLEN MOUNTING AND SUPPORT MEANS FOR FURNACE BURNERS 3 Sheets-Sheet l Filed April 29 1941 Dec. 7, 1943. L. B. LUELLEN 2,336,269

MOUNTING AND SUPPORT MEANS FOR FURNACE BURNERS Filed April 29, 1941 5 Sheets-Sheet 2 Dec. 7, 1943. L, B. LUELLEN, 2,336,269

MOUNTING AND SUPPORT MEANS FOR FURNACE BURNERS Fi1ed April '29, 1941 3 sheets-sheet 3 Patented Dec. 7, 1943 MOUNTING AND SUPPORT MEANS FOR FURNACE BURNERS Leland B. Luellen, Highland, Ind., assignor to Inland Steel Company, Chicago, Ill., a corporation of Delaware Application April 29, 1941, Serial No.` 390,984

Claims.

This invention relates to certain new and certain improved means for mounting and supporting furnace burners. It is intended to apply par` ticularly to open hearth and other furnaces where the` burner installations are relatively heavy and arev substantially extended into the furnace system, although it may be advantageously applied under other conditions as well.

In the operation of an open hearth furnace certain adjustments to burner direction are necessary or desirable during the Various stages of each heat. There are other adjustments as to burner position and directional characteristics which are desirable at intervals during thev furnace producing campaign to compensate for the progressive changes in the contour of the interior surfaces of the furnace. Finally, there are adjustments as to burner positioning which are frequently necessary after the periodic furnace relining or rebuilding. This latter need exists because there are always some small variations in furnace dimensions and levels from rebuilding to rebuilding due to various circumstances such as steel-work warpages, brick tolerances, joint thicknesses, etc.

Many and varied means for mounting and supporting burners have heretofore been devised. In some cases the devices now available may be fully adequate to the needs of the particular application for which they were designed, as for instance steam boilers, billet and slab furnaces, reheating units, etc. On the other hand, all of these existing devicesare either unsuited to those applications requiring the several characteristics specifically referred to above or else they fail `.to provide adequate 4and sufficient means by .which theseendsmay be practically attained.l

It is one of my objects to provide a burner mounting andsupport means which shall embody, in a self-contained form, sufficient and Wholly practical facilities by whicha burner position or direction may be changed in oneor all of ve different planes or elevations, and furthermore, to secure such adjustments by directly positive means that provide, both eXactness, so that repeated duplication of the adjustments may be accomplished, and likewise, stability and strength, so that a burners weight, vibration and other operating stresses will not cause displacement of the burner.

Another object is to provide a construction in which the various agencies for making acljustments asV required are independent of one another and, in which any of theadjustments can be made without necessitating the re-alignment of any of the other previously established adjustments. V

An additional object is to provide a burner mounting and support means which is independent of all brickwork construction and therefore not subject to displacement due to the melting or cutting away of such brickwork which is a natural and inevitable resultl of open hearth furnace operation, and additionally, is unaffected by the entire dismantling of adjacent furnace walls which takes place periodically when furnaces are being rebuilt.

A further object is to provide a burner mounting and support means in which no part rests or depends upon fuel, atomizing agent or water lines, and furthermore, in which any repair, alterations, or other work upon such lines has no influence upon nor relation to any of the mounting, supporting or adjusting features of said construction.

A still further object is to provide a construction of exceptionally compact nature which can be conveniently mounted upon the furnace binding in such a way that no working floor space is occupied and the passageway between adjacent furnaces is unimpeded. i

OtherI objects will be manifest from the following description:

This application is a continuation in part of my co-pending application for United States Letters Patent Ser. No. 347,736, filed July 26, 1940.

Referring to the accompanying drawings:

Figure 1 is a view in longitudinal sectional elevation of one of the two similar end portions of an open hearth regenerative furnace for producing steel,V the generalfeatures of which are of well known construction, showing incorporated therein a burner construction supported and mounted by means embodying my invention, the section being taken'atthe line I on Fig. 2 and viewed in thedirection of the'arrow.

Figure 2 is a plan view, partly sectional, of the structure shown in Fig. 1.

Figure 3 is an enlarged plan view of the burner f and its mounting and support means. l

Figure 4 is a view in side elevation of the burne and its mounting and support means.

Figure 5 is an end view of the burner and its mounting and support means, viewing the structure from the line 5, 5 on Fig, 2 'and in the direction of the arrows, this View showing the adjacent brick-stays of the furnace in section. y l

Figures 6, '7 and 8 are plan, side and front views, respectively, of a mounting bracket forming a part of the mounting and support means.

a zone, or passage, at each end of the combustion n zone and in communication therewith, these zones Y Y,

or passages being similar, the one at the furnaceend shown being indicated at I 3; pairs of up-take passages at opposite ends of the furnace opening upwardly into the zones I3, respectively, the up-takes at opposite ends of the furnace opening downwardly into cross passages, respectively, (not shown) at opposite ends of the furnace, the pair of up-takes at the furnace end shown being represented at I4; the above referred to cross passages |5 at opposite ends of the furnace communicating with ends of two checker chambers (not shown), respectively.

The furnace shown is iired, in accordance `with common practice, ,from its opposite ends alternately by burners, the hot products of combustion, when one of the burners is operating, discharging through one of the checker chambers and when the other burner is operating, through the other` checker chamber, to heat these chambers to high temperature, and hot combustion supporting air is supplied to the operating burner through the adjacent up-takes I4 from the checker chamber heated as stated in the operation of the burner.

The 'burner construction at the furnace end shown is represented at I E, it being understood that the burner construction at the opposite end of the furnace would be of the same construction.

The burner construction I6 comprises two major mechanical sections, one of which is the burner proper |00 which is of relatively long generally cylindrical form and in the applied position for use extends at its discharge end into the zone I3 through an opening I8 in an end wall I0 'of the furnace, and the other of which is the supporting and mounting mechanism |0I forI the burner proper and is located exteriorly of the furnace.

The mounting mechanism I 0| for the burner proper |00 comprises a substantially horizontal channel |02 located in the space between those of the metal vertical buck stays shown at 44 Vand forming the exterior binding and framework portion of the furnace construction in accordance with common practice which are disposed immediately adjacent to, and atopposite sides of, the burner-receiving opening !8 in the furnace end wall, the channel |02 being secured to these buck stays, as for example by welding its ends to these buck stays. The main support channel |02 supports a bracket |03, forming a part of the means 10|, through the medium of bolts |04 which extend through openings |05 in the ends of the bracket |03 and into vertical series of horizontally elongatedvequidistantly spaced lots |08 in theV channel |02 to adapt the bracket to be secured' in place at different elevations as desired and to allow variations in dimensional relationship between the longitudinal centers of' the hearth and burner, respectively.

The mounting bracket |03 is shown as formed as a one piece structure presenting a bottom plate portion |01, a front upright plate portion |08, upright spaced apart webs |09, forming brace portions and located in the interior angle between the plate portions |01 and |08 and blocks ||0 on the front face of the front portion |08 having upwardly opening trunnion-grooves ||I.

Mounted in the trunnion-receiving grooves are trunnions I4 provided on the burner proper |00. The trunnions ||4 are provided on a trunnion collar I|5 which surrounds the burner proper |00 and in which the burner proper is longitudinally slidably adjustable, the burner proper being clamped to the collar I I5 by set screws I6.

The mounting mechanism also comprises means for adjusting the burner proper |00 on its trunnions ||4 into different angular positions in a vertical plane and holding it in any position to which it may be adjusted; these means comprising the mounting bracket |03, a cylindrical nut I I1 the upper surface of whichv is of substantially spherical form as represented at |I8 and having an annularly anged portion I I 9, the nut I|1 being journaledI in a retainer plate |20 secured, as by bolts |2I, to the underside of the mounting bracket |03 and thus being held against lengthwise movement, on the bracket, the underside of the bracket |03 opposed by the nut II1 being of spherical form as represented at |22 to conformingly fit the top surface of the nut ||1; a hand wheel |23 secured to the nut ||1, as by a screwpin |24; and a threaded rod |25 extending through an opening- |28 in the bottom portion of the bracket |03 and engaging the'thread of the nut I1. i

The upper end of the rod |25 has a head |21 with a hole |28 through which a pin |29 mounted in the ends of a strap hanger |30, and held in place by cotter pins |3I, extends.` The strap hanger |30 surrounds the burner proper I 00 in which the latter is longitudinally slidably adjustable; set screws |32 on the hanger |30 adapting the hanger to be-clamped to the burner proper in the various positions of adjustment of 'the burner proper in the hanger.

According to the modification of the means shown in Fig. 10 for adjusting the burner proper into different angular positions in a vertical plane, the nut, herein shown at |33 and corresponding to the nut II1, has interposed between it and the bracket |03, a thrust bearing represented at |34 shown as comprising upper and lower ballrace members |35 and I3Brespectively, with an interposed circular series of balls |31, and a selfaligning washer |38 between the bracket |03 and the upper ball-race member |35, the upper surface of the ball-race member |35 and the under surface of the washer |38 being conformingly spherically contoured as shown.

From the above description it will be manifest that the burner proper |1, may be adjusted up and down bodily through the adjustable connection of the bracket |03 with the channel |02 fixed to the buck stays 44, and tilted to any desirable angle at its trunnion support on the bracket |03, these adjustments being especially desirable as it adapts the burner proper for adjustment to such position as will insure the impingement of the flame against the charge in the furnace at the desired angle under all operating conditions and permits of the desired flame clearance at all times,'even in the event of the building up of accumulations at the furnace-end which, if provision for such adjustments were not afforded, would interfere With the proper operation of the furnace.

Furthermore, provision is made for the positioning of the pivotal supporting means and,

therefore, the swinging adjustment of the burner proper, in a horizontal plane, viz., about a fixed line to different angular positions in a horizontal plane. In the arrangement shown this is accomabout which the bracket |03 may be adjusted.

In making this adjustment the setscrews H3 which screw in holes ||3a in the plate portion y|08 of the bracket |03 are loosened and then opposite pairs of the bolts |04 are alternately loosened and tightened until the desired tilting 'adjustment of the bracket is attained after which the setscrews H3 are set against the channel |02. Thus it will be manifest that the burner proper may be adjusted to various angular positions in a substantially horizontal plane by virtue of the rotational adjustment of the bracket |03 in a substantially horizontal plane.

The burner proper may be installed for application by sliding the collar H5 and strap hanger |30 onto the burner proper |00, setting the burner proper into the burner opening I8 in the furnace end Wall l0, seating the oppositely disposed trunnions ||4 into the trunnion-receiving grooves positioning the burner proper into the furnace in such a manner thatl the discharge end of the burner proper is at the desired point within the combustion zone I3, tightening the trunnion collar H5 and the strap hanger |30 about the burner proper |00 by means of the set screws H5 and |32, respectively, and staying the hanger |30 to the threaded bar head |2'i by means of the pin |29 inserted through the ends of the hanger |30 and the hole in the head |21. The vertical angular adjustment of the burner is then attained by ro-tating the handwheel |23 to raise or lower the hanger |30 as desired, thereby providing means for positioning the burner proper I1 about its trunnions IM.

Further positioning o-f the burner proper is provided for by the provision of the holes |05 in the bracket |03 and the parallel equidistantly spaced slots |06 in the channel |02, in which holes and slots the bolts IM may be selectively inserted.

By such structure, provision is made for the rais- |04), thereby Varying the dimensional differen- I tials between the center line of the burner proper and the longitudinal center line of the furnace. Thus the positioning of the bracket |03 relative to the channel |02 provides means for positioning the positive pivotal (trunnion) support for the burner proper, in lateral and vertical planes.

The capability of the bracket 03 for tilting adjustment as above described, provides means for rotating the burner proper |00, while pivotally supported at its trunnions H4, to different positions in a substantially horizontal plane.

The burner proper may be removed from the mounting and support means |0| by removing the pin and lifting the trunnions llc out of the trunnion-receiving grooves and then lifting the burner proper out of the furnace opening I8 by any suitable means. Another burner may then be fitted with the hanger and the trunnion collar I5 and put into place by seating the trunnions |||2 into the trunnion-receiving grooves and fastening the hanger |30 to the head |21 by means of the pin |29.

None of the positioning adjustments are thus changed when a burner proper is removed and the same or another burner proper is placed upon the mounting means, except in the latter case the longitudinal sliding adjustment of the burner proper thro-ugh the trunnion collar ||5 and the hanger |30, and this may bel made constant by placing the trunnion collar ||5 and the hanger |30 at the same relative positions on the burner proper which is installed as said members are found on the burner which is removed.

As will be understood the burner mounting and support means afford five different adjustments of the burner proper: Bodily lateral adjustment of the burner proper is afforded by the elongated slots |06 in the channel |02; vertical bodily adjustment is afforded by the provision of the vertical series of the slots |00; swinging adjustment of the burner proper into different angular positions in a substantially horizontal plane is afforded by the adaptability of the adjustment of the bracket |03 at its rib |2 as a pivot point; angular adjustment of the burner proper in a vertical plane is alforded by the trunnion support for the burner proper and the adjusting means comprising the nut I or the nut 33, as the case may be, and the threaded rod |25; and lengthwise adjustment of the burner proper relative to the mounting means by its adaptability for length- Wise movement in the hanger |30 and collar H5.

While I have illustrated and described certain particular constructions embodying my inventon I do not wish to be understood as intending to limit it thereto as the same may be variously modified and altered and the invention embodied in other forms of structure without departing from the spirit of the invention.

What I claim as new and desire to secure by Letters Patent, is:

l. In combination with a furnace structure having a burner receiving opening, a burner construction having a burner proper extending into the interior of the furnace through said opening and mounting means for said burner proper comprising a member supported on the furnace structure, a rib on said member at which said member is fulcrumed on the furnace structure for rocking adjustment in a horizontal plane, and means for holding said member in adjusted position.

2. In combination with a furnace structure having a burner receiving opening, a burner construction having a burner proper extending into the interior of the furnace through said opening and mounting means for said burner proper comprising a member supported on the furnace structure, a rib on said member contacting a portion of said struc-ture at which said member is fulcrumed for rocking adjustment in a horizontal plane, and means engaging said member at opposite sides of said rib for holding said member rigidly in adjusted position.

3. In combination with a furnace structure having a burner receiving opening, a burner construction having a burner proper extending into the interior of the furnace through said opening and mounting means for said burner proper comprising a supporting member secured to the furnace structure, a second member having a rib at which said second member is fulcrumed on said supporting member for rocking adjustment in a horizontal plane, and means for holding said second member in adjusted position.

- 4. In combination with afurnace structure,

a burner construction comprising a burner proper and mounting means therefor on said furnace structure comprising a supporting member adjustable laterally on said furnace structure into different set positions, adjustable vertically on -said furnace structure into different set positions and adjustable horizontally into different angument into different positions in a vertical plane, and means engaging said burner proper and said 'member for. holding said burner proper .in adjusted position on said member.

5. Incombination with a furnace structure, a

burner construction comprising a burnerY proper and mounting means therefor on said furnace structure comprising a supporting member adjustable into different set positions laterally on said furnace structure, vertically on said furnace struc-ture and horizontally into different angular positions relative to the center line of the furnace structure, means pivotally supporting said burner proper on said member for adjustment into different positions in a Vertical plane, and means engaging said burner proper and said member for holding said burner proper in adjusted position on said member, said burner proper also being lengthwise adjustable relative to said member.

y LELAND B. LUELLEN` 

